A google chrome extension let you save instagram picture/video easily.
Since the design of instagram, you can't just right click and save picture or video directly. This extension will help you save what you want easily.
Right click on the instagram picture/video which you want to save into your computer, the context menu will show you a new menu item called '儲存IG圖片/影片'. Click the option and save the picture/video.
This extension will only work when you visit the instagram official site.